Changes header of today's cycle day overview page

components/header/cycle-day.js

@@ -2,11 +2,18 @@ import React from 'react'
 import {
   View,
   Text} from 'react-native'
+import { LocalDate } from 'js-joda'
 import moment from 'moment'
 import styles from '../../styles'
 import NavigationArrow from './navigation-arrow'
 
-export default function CycleDayHeader(props) {
+const FormattedDate = ({ date }) => {
+  const today = LocalDate.now()
+  const dateToDisplay = LocalDate.parse(date)
+  return today.equals(dateToDisplay) ? 'today' : moment(date).format('MMMM Do YYYY')
+}
+
+export default function CycleDayHeader({ date, ...props }) {
   return (<View style={[styles.header, styles.headerCycleDay]}>
     <View
       style={styles.accentCircle}
@@ -15,7 +22,7 @@ export default function CycleDayHeader(props) {
     <NavigationArrow direction='left' {...props}/>
     <View>
       <Text style={styles.dateHeader}>
-        {moment(props.date).format('MMMM Do YYYY')}
+        <FormattedDate date={date} />
       </Text>
       {props.cycleDayNumber &&
         <Text style={styles.cycleDayNumber}>